Air-compressing pump.



S. DAHLBERG. AIR GOMPRBSSING PUMP.

APPLIOATION FILED' 11.53.20, '1909.

Patented July 27, 1909.

\ JN VENTOR,

SVEN DAHLBERG, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR OFATHREE-TENTHSTC GUSTAF N. TEGNELL, OF SPRINGFIELD, MASSACHUSETTS.

AIR-COMPEEssING PUMP.

Specification of Letters Patent.

' Patented July 27, 1909.

Application led March 20, 1909. Serial No. 484,814.

To all whom it may concern:

Be it known that I, SVEN DAHLBEEG, a citizen of the United States ofAmerica, and resident of Springfield, -in the county of Iflampden andState of Massachusetts, have invented certain new and usefulImprovements in Air-Compressing Pumps, of which the following is lafull, clear, and exact description.

This invention relates to air compressing pumps, especially availablefor the .inflation of pneumatic tires for the wheels of automobiles andother vehicles of the general character of, and for improvements on, thepump shown and described in Letters Patent of the United States grantedto me Nov. 24, 1908, Naooaeeo A leading object of this invention, forimprovement in an air pump comprising a plurality of separated Ycylinders and a footoperated. yoke for actuating` the piston rods of thecylinders, is to so arrange the connections between the yoke andthe'piston rods as to leave the space between the upper portion of thecylinders free and clear for the accommodation of the knee portion ofthe operators leg, whereby the movements of the latter for operatingtheypump in a powerful manner may be most comfortably performed. p

Other objects are to improve the construction of the means for holdingand steadying the pump bythe hand or hands of the operator while thepumping action is being` performed by the foot; and generally toimprove, simplify, and cheapen the construction of the apparatus. f

The invention is described in conjunction with the accompanying drawingsand set forth in the claims. Y Y

In the drawings z-Figure l is a front elevation of the air pump, one ofthe steadying handles being shown as moved to and locked in its elevatedposition, while the other steadying handle is, by full lines, shown asin its lowered position. Fig. 2 is ay sectional elevation of the pump asseen at right angles to Fig. 1, the portions in. section being as takenon the line 2 2. Fig. 3 is a plan view of the foot-operated yoke. Fig. 4is a partial horizontal sectional view on line 4 4, Fig. 1, to representcertain details of construction.

Similar characters of reference indicate corresponding parts in all ofthe views.

In the drawings, A A represent two vertil cal separated and parallelpump cylinders which are supported and connected together by a base B ofsuitable construction and design, each cylinder having, as understood, apiston a therein,-the pistonrod C for each piston extending above thetop of each cylinder.

The air inlet way, ythe internal valves and the 'outlets for thecompressed air understood as located in the base or lower portion of thepump and having connection with the flexible tube D are or may be of anyusual or approved construction and arrangement and, forming no part ofthe present invention, are not here shown or described.

Each piston rod C has n' at its upper end which is above the upper endof the cylinder,

a transversely arranged rigid bar l) which has its middle portionsecured to theupper extremity of the piston rod, and which extends atopposite sides of the piston rod at right angles to a line between thecenters of the cylinders.

G represents the yoke comprising separated upper and lower portions d,d2 to be envgaged by a persons foot, the lower yoke member beingarranged between the cylinders and having, asV shown in Fig. 3,bifurcated extremities f to embrace `the front and rear sides of thecylinders while heely playing vertically relatively thereto.

g g represent vertically arranged rodsin pairs and respectivelyconnected with the opposite extremities of the transverse bars b carriedat the upper yends of the piston rods and connected at their lower endswith the portions of the lower member of the yoke which are located atthe front and rear sides of the cylinders. The 4connections of the rodsg g with the extremities of the lowery yoke member and with they endportions of the transverse bars b of the piston rod are, asindicatedinthe drawings, by means of nuts o 0 in pairs vengaged' withthe screw threaded extremities of the rods and tightened at oppositesides of the parts t and d2.

The double cylinderpump comprising the parts in arrangement as describedand shown, is one affording an unobstructed space between the upperportions of the cylinders for the accommodation of the knee of theoperator who by his foot, in engagement with the yoke is operating thepump.

In the pump as here shown, a pair ofk steadying handles are provided asappurtenances of thecylinders to enable a person, .whileoperating thepump by foot movement,

to steadily hold the pump body without having to stoop more than may becomfortable. These handles carried at the upper end of straight verticalstems are raised, and locked intheir elevated positions, when the pumpis to be used, but are susceptible of being lowered in a considerableextent so that when the pump is not in use the handles are located butlittle above the tops of the cylinders; and it will be pointed out thateach cylinder has at its upper portion a Vlateral extension comprisingupper and lower' members 10 and l2 with a separating edgewise openingrecess 13 therebetween,-there being a vertical aperture 14 through thelateral extension which practically crosses Vthe said recess, andthrough which the handle carrying stem may freely vertically move. Eachhandle stem is provided at its lower end with a lug, dog, or button fi,having essentially no projection radially from the stem at one sidethereof, but having a material extension beyond such stem .at theopposite side thereof, so that under a rotative movementin one directionoit' the stem the lug may acquire an engagement in said recesses abovethe lower member 12 for maintaining the handle in its elevatedposition,-it being understood that by partially rotating the handleYcarrying stem to swing the lug clear from its engagement with the member12 on which ithad 'been supported, the handle carrying rod or stem maybe downwardly slid through the guiding aperture 14 therefor to bring thehandledown closely to the top of the cylinder Vfor economy of space intransportation or when the pump is to .be stowed away.

I claim1- f 1. In an -air pump, a base, a pair ot' separated verticalcylinders supported by and -iising above the base having their movablepiston rods extending above the upper ends oi lthe' cylinders, and eachprovided with a bar alixed thereto and extending at opposite'sid'es ofthe piston rod at right angles to a line between .the cylinders, amovablelyoke arranged between the cylinders, comprising separated upperand lower portions to be engaged and operated bya persons foot, andpairs of vertically varranged rods connected lto the oppositeextremities oi said transverse bars and connected at the lower portionsto the extremities oi said yoke.

2. In an air pump, a base, a pair oi' separated -vertical cylinders,supported by and rising above the base, movable piston rods extendingabove the upper ends of the cylinders andveach provided with atransversely arranged bar which has its middle portion secured to theupper extremity oil the piston rod and which extends at opposite sidesof the piston rod at right angles to a line between the cylinders, ayoke comprising sepp arated upper and lower portions to be engaged by apersons foot, the lower yoke member being arranged between the cylindersand having bifurcated extremities to embrace the iront and rear sides ofthe cylinders, and pairs ci' vertically arranged rods connected with theopposite extremities oiA said transverse bars, and connected at theirlower ends with portions of the lower member of the yoke which arelocated at the front and rear'sides of the cylinders. Y

3. In an air pump of the character described, a pair of verticalseparated pump cylinders supported and connected together at their lowerportions and having an open and unobstructed space between their upperportions, a yoke to be engaged and operated by a persons foot, betweenthe cylinders, connections between the piston rods of the respectivecylinders and the saidV yoke, having their locations outside of thespacebetween the cylinders, and means forrholding the base connectedcylinders against movement while the foot yoke is being operated.

4. In an air pump, a supporting base and a vertical cylinder risingthereabove having a piston rod the upper end of which projects above thecylinder, said cylinder having at its upper portion a lateral extensioncomprising upper and lower members with a separating recesstherebetween, and a vertical aperture intersecting said recess, a handleprovided rod vertically playing through said aperture and provided at alower .portion vthereof with a lug adapted, under rotative movement inone direction of the rod, to acquire an engagement in said recessbetween the separated upper and lower members oi' said extension andadapted under rotative movement of the rod in a reverse direction to befree from such engagement to permit vertical movements oi the rod.

Signed by me at Springlield, Mass., in presence oi two subscribingwitnesses.

Witnesses: Y

GUsTAv N. TEGNYELL, WM. S. BnLLows.

